Boring-machine.



- To all whom it may concern:

FADOLPI-I STORM AND EDWARD o. OHAIR, F THOMPSON, IOWA, ASSIGNORS TO STORM AND OI-IAIR COMPANY; A COPARTNERSHIP CONSIS'IING or OSCAR w; NELSON AND EDWARD (J. OI-IAIR, or THOMPSON, IOWA.

BORING-MACHINE.

7 Specification of Letters Patent.

Patented Dec. 19, 1 916.

Application filed January 5, 1916. Serial No. 70,451.

Be it known that we, ADOLPHSTORM and EDWARD C. OHAIR; citizens of the United- States, residing at Thompson, in the county of \Vinnebago, State of Iowa, have invented certain new and useful Improvements in Boring-lilachines; and we do hereby declare the'following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use thesame.

Ouninvention relates to boring machines of thetype adapted for use in reboring the cylinders of explosive engines.

It is ourpurpose to provide a boring ma chine of the type named in which the parts are capable of rearrangement in a quick and easy manner so that the machine can be utilized in reboring cylinders with non-detachable heads by inverting the cylinder and operating the cutter head downwardly, and also in reboring cylinders with detachable heads by reversing the cutter head and then operating the latter upwardly through the medium of a left hand thread bar.

' It is our further purpose to provide acutter head with which may be detachahly associated split lead rings to enable the head to befutilized with facility in cylinders having bores of difierent diameters.

lVith'the above and other objects in view our invention consists in the details of construction and in the arrangement and comfully described'and particularly pointed out in the appended claims.

In describing the invention in detail ref-- erence will be had to the accompanying drawings wherein like characters of refer ence denote corresponding parts in the several views and in which- Figure 1 is a vertical section of a fragment of a cylinder of an explosive engine, said cylinder being of the non-detachable head type and the improved borlng machme being applied to initiate reboring of the cylinder; Fig. 2, a vertical section through the cutter head of the device; Fig. 3, a View similar to Fig. 2 taken on another plane and showing the lead ring applied to the head; Fl 4, a plan view of What is shown in Fig. 2; Fig. 5, a vertical section through a fragment of the upper portion of the machine;

' and Fig. 6, a view similar to Fig. 1 showing the manner of applying the machineto iuslir tute the reboring of a cylinder having a detachable head.

Referring 'to Figs. 1 to 5 inclusive the invention is shown as comprising a substantially circular head A including sections and 11 detachably secured together by means oflock screws 12. The section 11 is adapted to be correctly positioned with respect to the section 10 for the application of the lock screws 12 by means of studs 13 fixed to the section 10 and engageable in passages l-t formed in the section 11. The sections 10 and 11 are provided centrally with aliucd axial passages 14 and 15 respectively. said passages being respectively provided with threads 16 and 17. The outer end-of the section 10 is beveled circumfe'rentially as at 18 fora purpose that will presently appear. The section 10 is provided on its inner end with a plurality of radial grooves 19 in each of which is seated a cutter 20 and these cutters are held in place through the medium of the section 11 which latter is clamped againstthe cutters by the'action of the lock screws with the threads 16 of the passage 15* is the lower end of a tubular thread bar 22 the upperend of which is suitably squared to receive an operating handle 23 for effecting rotation of the bar. This bar has threaded engagement with a tubular bushing 21 mounted in a central opening 25 of a guide and feed plate 26, said plate 26 resting on the upper end of a tubular guide rest 27 the lower end of which engages with the body of the engine structure. Disposed 0n the upper side of the feed plate 26 is a feed plate holder 28 provided with a central opening 29 through which the thread bar 22 passes. This feed plate holder 28 is provided with lateral extensions 30 provided respectively with slots 31 through which latter are engaged bolts 32 adapted to be threaded in a convenient threaded opening in the engine body for the purpose of securing the machine in a fixed operative relation to the cylinder to be bored.

- Disposed in the bore of the thread bar 22 is a rod 33 the inner end oiiiwhiclf projects I into the passages Hand 15 and is provided with a head 34 having threaded engagement with the thread 16 and including a tapered portion 35 coacting with the' beveled inner ends 21 of the cutters so that when the rod 33 is rotated in one direction thehead'34 will be moved toward the section 11 and force the cutters 20 outwardly. The end of the rod '33 remote from the head 34 is squared as at 36 for the reception of a suitabe wrench for facilitating rotation of the rod 33 to adjust the cutters 20.

When it is desired to rebore a cylinder having a non-detachable head said cylinder is first inverted and the boring machine applied as shown in Fig. 1. When the machine is thus applied it will be obvious that rotation'of the thread bar 22 through the medium of the handle 23 will rotate the cuta around the'beveled portion 18 of the section '10. These rings 37 and38 serve to hold the cutter head centered during the first part of the boring operation under the conditions shown in Fig.1 until the head has fully entered the cylinder when the ring 37 will become automatically detached. The lead ring 38 also enables a single cutter head to be utilized in reboring cylinders having bores of different diameters. The ring 37 is also uti lized in adjusting the cutters 20 before the boring operation is instituted, the ring being placedaround the section 10 in the plane of the cutters and the latter then adjusted until they properly engage the inner face of the ring when the latter is-removed after the cutter has been locked by manipulating the screws "12. It will of course be understood that-a number of rings 37 and 38 of different sizes are employed in connection with a single boring machine so as to maintain the utility of the machine under varying condi thread bar 22 employed with its lower end engaged with the threads 16. 3 Under these conditions the cutters 20 are also turned so as to properlv present the beveled inner ends 21 to the tapered portion of the head 34:.

What is claimed is e 1. In a boring machine of the class described, a cutter head comprising a pair of sections arranged end to end, locking screws for clamping said sections together, said sections being provided with alined longitudinal threaded passages, one 'ofjsaid sections having its inner end provided with a plurality of radial groovesfrutters adjustably mounted in said grooves and having beveled inner end portions, 'a tapered adjusting member threaded in one of said longitudinal passages and coacting with the beveled inner ends of thecutters to force the latteroutwardly when said member is rotated in one direction, and a tubular thread bar engaged in the other longitudinal passage and through the bore of which the adjusting member extends, I

2. Ina borin machine of the'class described the com ination of a head' having a longitudinally threaded passage therein adapted to' receive a threadbar, one of the ends of said head being circumferentially beveled to receive a. correspondingly beveled lead ring, and cutters adjustably mounted in sald heath v In testimony whereof, we affix our signatures in the presence of WltDQSSQSJ ADOLPH STORM. i EDWARD C. OHAIR. 

